SpoilerTV: Clarke (Eliza Taylor) and Finn (Thomas McDonell) attempt to broker peace with the Grounders but all hell breaks loose when Bellamy (Bob Morley), Jasper (Devon Bostick) and Raven (guest star Lindsey Morgan) show up armed and ready for battle. Octavia (Marie Avgeropoulos) and Lincoln (guest star Ricky Whittle “Single Ladies”) grow closer. Meanwhile, tragedy strikes during the Unity Day celebration on the Ark. Paige Turco, Henry Ian Cusick, and Chris Larkin also star. John Behring directed the episode written by Kim Shumway & Kira Snyder (#109).